How To Correct Cracks in a Concrete Sub-floor

While it is not desirable, it is not uncommon for cracks to form in a concrete sub-floor. It’s the responsibility of a flooring contractor to make sure that the cracks don’t allow excess moisture to affect the flooring and cause the crack to grow. A flooring inspector or floor repair contractor has several different options to use in making the repair before putting flooring material like tile or wood down.

The correction and repair methods will definitely differ depending on each unique situation and what type of flooring will be above the concrete sub-floor. Here are two of the most common methods for correcting cracks they have found in a concrete sub-floor.

Cracks and Tile Floor Installation

Preparing the sub-floor for tile means that any cracks in the concrete need to be sealed up completely. Most experts recommend applying some waterproof crack isolation membrane to the cracks. The substance can be applied with a trowel or roller and forms a smooth and watertight seal. It also prevents the cracks from growing. It inhibits any mold and mildew growth and can be used over new concrete that is only a few days old. It’s the best way to prepare residential or commercial concrete sub-floors for tile.

Cracks and Wood Floor Installation

Preparing a cracked concrete sub-floor for a hardwood floor installation requires more preparation than for tile. The best method to deal with cracks is to put down a plywood sub-floor that is clean, dry, level and structurally sound. The plywood sub-floor floats over the crack, separating the wood flooring from the substrate. In this case, it’s the best option for wood floor installation.

Experienced wood flooring installers know that having a strong and proper concrete sub-floor is the key to a durable and trouble-free top floor. Repairing cracks properly is the best way to control moisture, stop cracks from spreading, and maintain stability. The result is a fine foundation on which to install beautiful, durable hardwood flooring that will last for many years.

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